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Journal articles on the topic 'Polypropylene'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Lukanina, Yulia, Anatoliy Khvatov, Natalya Kolesnikova, and Anatoliy Popov. "The Effect of Cooling Rate during Crystallization on the Melting Behavior of Polypropylenes of Different Chemical Structure." Chemistry & Chemical Technology 10, no. 4 (2016): 479–83. http://dx.doi.org/10.23939/chcht10.04.479.

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The melting behavior of polypropylenes of different chemical structure (isotactic homopolypropylene, propylene-based block and random copolymers and maleic anhydride grafted polypropylene) was studied by differential scanning calorimeter (DSC) and optical microscopy. Melting behavior and the crystal structure of polypropylene and its copolymers were observed depending on the crystallization rate, chemical nature of co-monomer unites and regularity of co-monomer units arrangement in the polypropylene main chain.

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2

Lee, Chao-Yu, and Chia-Wei Chang. "Dielectric Constant Enhancement with Low Dielectric Loss Growth in Graphene Oxide/Mica/Polypropylene Composites." Journal of Composites Science 5, no. 2 (2021): 52. http://dx.doi.org/10.3390/jcs5020052.

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Polypropylene has been widely used as dielectric material in organic thin-film capacitors due to their high breakdown strength, low dielectric loss and self-healing capability. However, polypropylene’s energy density is relatively low. Increasing the energy density of polypropylene by adding materials with a high dielectric constant is commonly used. Still, it often leads to an increase in dielectric loss, lower dielectric strength and other shortcomings. In this study, a thin 2D platelet of mica/graphene oxide composite material was made from exfoliated mica as a substrate and attached by gra

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3

Mezey, Zoltán, and Tibor Czigány. "Mechanical Investigation of Hemp Fiber Reinforced Polypropylene with Different Types of MAPP Compatibilizer." Materials Science Forum 537-538 (February 2007): 223–30. http://dx.doi.org/10.4028/www.scientific.net/msf.537-538.223.

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Mechanical properties of hemp fiber reinforced polypropylene were investigated. Hemp fibers were carded together with polypropylene fibers, and needle punched. Composites were prepared by hot pressing of the PP/hemp mats. Hemp content was varied between 0 and 50 % by weight, in 10% steps. A treatment with two different maleic anhydride grafted polypropylenes was applied in order to increase the fiber/matrix surface adhesion. Tensile, three-point bending and Charpy tests were carried out on the treated and untreated composites.

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4

Zhang, Kelei, Junlong Yao, Fangju Zhu, et al. "Recent Advances in Preparation and Application of BOPP Film for Energy Storage and Dielectric Capacitors." Molecules 30, no. 7 (2025): 1596. https://doi.org/10.3390/molecules30071596.

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Energy storage polymers are critical to modern microelectronics, electric vehicles, and wearable devices. Capacitor energy storage devices are the focus of contemporary research, with film dielectric capacitors being the focus of mainstream research. Research on polymers—particularly polypropylene—has yielded numerous innovations, but their energy storage performance and breakdown resistance under extreme conditions remain unsatisfactory. Numerous reports have proposed various solutions, but systematic reviews, classifications, and investigations regarding the effects of processing on polyprop

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5

Ristolainen, Noora, Ulla Vainio, Santeri Paavola, Mika Torkkeli, Ritva Serimaa, and Jukka Seppälä. "Polypropylene/organoclay nanocomposites compatibilized with hydroxyl-functional polypropylenes." Journal of Polymer Science Part B: Polymer Physics 43, no. 14 (2005): 1892–903. http://dx.doi.org/10.1002/polb.20485.

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6

Prvulović, Slavica, Predrag Mošorinski, Ljubiša Josimović, et al. "Influence of Cutting Regime Parameters on Determining the Main Cutting Resistance during Polypropylene Machining." Polymers 16, no. 11 (2024): 1537. http://dx.doi.org/10.3390/polym16111537.

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This study examines the impact of cutting regimes on determining cutting resistance in the processing of polypropylene (PP) using the CNC lathe EMCO F5. The rationale for this research stems from polypropylene’s rarity among thermoplastics in possessing structural stability, allowing for its comparison to metals and practical application in products replacing metal parts. Leveraging its favorable mechanical properties, polypropylene finds utility in producing parts subject to dynamic loads, boasting high resistance to impact loads—particularly undesirable in machining. An advantageous characte

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7

Bahreini, Ebrahim, Seyed Foad Aghamiri, Manfred Wilhelm, and Mahdi Abbasi. "Influence of molecular structure on the foamability of polypropylene: Linear and extensional rheological fingerprint." Journal of Cellular Plastics 54, no. 3 (2017): 515–43. http://dx.doi.org/10.1177/0021955x17700097.

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The foaming structure and rheological properties of four different isotactic homo-polypropylenes with various molecular weights and an isotactic long chain branched polypropylene were investigated to find a suitable rheological fingerprint for PP foams. The molecular weight distribution and thermal properties were measured using GPC-MALLS and differential scanning calorimetry, respectively. Small amplitude oscillatory shear data and uniaxial extensional experiments were analyzed using the frameworks of van Gurp-Palmen plot (δ vs. | G*|) and the molecular stress function model, respectively. Th

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8

Gao, Lujie, Hegang Ren, Yanhui Hou та ін. "Synthesis of High-Molecular-Weight Polypropylene Elastomer by Propylene Polymerization Using α-Diimine Nickel Catalysts". Polymers 16, № 16 (2024): 2376. http://dx.doi.org/10.3390/polym16162376.

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The α-diimine late transition metal catalyst represents a new strategy for the synthesis of atactic polypropylene elastomer. Taking into account the properties of the material, enhancing the molecular weight of polypropylene at an elevated temperature through modifying the catalyst structure, and further increasing the activity of α-diimine catalyst for propylene polymerization, are urgent problems to be solved. In this work, two α-diimine nickel(II) catalysts with multiple hydroxymethyl phenyl substituents were synthesized and used for propylene homopolymerization. The maximum catalytic activ

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9

Chen, Jianjun, Yueyue Jia, Zhiye Zhang, Xinlong Wang, and Lin Yang. "Effects of Chlorinated Polypropylene on the Conformation of Polypropylene in Polypropylene/Chlorinated Polypropylene/Polyaniline Composites." Journal of Spectroscopy 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/317813.

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We investigated the changes in the conformation and crystalline structure of polypropylene (PP) using a combination of Fourier transform infrared spectroscopy (FTIR), wide-angle X-ray diffraction (WAXD), and differential scanning calorimetry (DSC) based on PP/chlorinated PP (CPP)/polyaniline (PANI) composites. The DSC heating thermograms and WAXD patterns of the PP/CPP/PANI composites showed that theβ-crystal was affected greatly by the CPP content. Characterization of the specific regularity in the infrared band variation showed that the conformational orders of the helical sequences in PP ex

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10

Melinda, Annisa Prita, Eka Juliafad, and Fajri Yusmar. "Pemanfaatan Serat Polypropylene untuk Meningkatkan Kuat Tekan Mortar dan Kuat Tekan Pasangan Bata." CIVED 7, no. 3 (2020): 176. http://dx.doi.org/10.24036/cived.v7i3.111906.

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Kuat tekan mortar merupakan parameter utama untuk menentukan kualitas mortar. Kuat tekan didefinisikan sebagai perbandingan antara beban yang diberikan dan luas penampang sampel mortar yang diuji, yang dinyatakan dalam kg/cm². Sedangkan pengujian kuat tekan batu bata merah dilakukan untuk mendapatkan nilai kuat hancur,yang merupakan perbandingan antara beban maksimum yang diberikan sampai batu bata merah hancur. Penelitian ini merupakan penelitian eksperimental tentang kuat tekan mortar dan kuat tekan pasangan bata dengan penambahan serat Polypropylene. Sampel uji mortar adalah kubus berukuran

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11

YAMADA, Masaya. "Polypropylene." NIPPON GOMU KYOKAISHI 80, no. 8 (2007): 288–91. http://dx.doi.org/10.2324/gomu.80.288.

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12

Sano, Takezo, and Masahiro Kakugo. "Polypropylene." Kobunshi 37, no. 11 (1988): 808–9. http://dx.doi.org/10.1295/kobunshi.37.808.

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13

Woo, Jae-Hun, and Soo-Young Park. "Polypropylene nanocomposite with polypropylene-grafted graphene." Macromolecular Research 24, no. 6 (2016): 508–14. http://dx.doi.org/10.1007/s13233-016-4067-8.

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14

Dharmarajan, N., and L. G. Kaufman. "High Flow TPO Compounds Containing Branched EPDM Modifiers." Rubber Chemistry and Technology 71, no. 4 (1998): 778–94. http://dx.doi.org/10.5254/1.3538504.

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Abstract Polymer blends of ethylene-propylene elastomers and polypropylene plastics, referred to as thermoplastic olefins, are finding increasing use in automotive applications. The combination of attractive mechanical properties, low raw material cost and recyclability make these materials ideal substitutes for expensive engineering thermoplastics (polycarbonate/polybutylene terephthalate alloys) and nonrecyclable polyurethane systems. The primary application is in automotive bumper fascia. This paper describes the addition of long chain branched ethylene-propylene elastomers in thermoplastic

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15

Naguib, Hani E., Jin Wang, Chul B. Park, Anjan Mukhopadhyay, and Norbert Reichelt. "Effect of Recycling on the Rheological Properties and Foaming Behaviors of Branched Polypropylene." Cellular Polymers 22, no. 1 (2003): 1–22. http://dx.doi.org/10.1177/026248930302200101.

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The effects of recycling of branched polypropylenes on their rheological properties and foamability are studied in this paper. The rheological properties and foamability of branched polypropylene are compared with those of the virgin sample. The main purpose of the study was to explore the possibility of using recycled materials to make the acceptable foam products. The recycled polypropylenes showed the lower melt strength due to the lowered molecular weight and disentanglement of molecules. However, the high-shear viscosities of the virgin and recycled resins exhibited almost the same values

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16

Panumati, S., T. Amornsakchai, and C. Ramesh. "F-9 HIGH STRENGTH POLYPROPYLENE FIBER FROM POLYPROPYLENE/CLAY COMPOSITE(Session: Composites II)." Proceedings of the Asian Symposium on Materials and Processing 2006 (2006): 124. http://dx.doi.org/10.1299/jsmeasmp.2006.124.

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17

Cui, Lili, and D. R. Paul. "Evaluation of amine functionalized polypropylenes as compatibilizers for polypropylene nanocomposites." Polymer 48, no. 6 (2007): 1632–40. http://dx.doi.org/10.1016/j.polymer.2007.01.036.

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18

Chen, Zhe, Wei Huang, Peng Fei Fang, Wen Yu та Shao Jie Wang. "Positron Lifetimes and Crystallinity of γ-Irradiated Polypropylenes". Materials Science Forum 733 (листопад 2012): 163–66. http://dx.doi.org/10.4028/www.scientific.net/msf.733.163.

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The microstructure of the polypropylenes (PP) irradiated by gamma ray was studied by positron lifetime technique and differential scanning calorimetry (DSC). Lifetime measurement shows o-Ps intensity decreases with increasing γ irradiation dose. The crystallinity of irradiated samples was detected by DSC method. The correlation between o-Ps intensity and crystallinity indicates γ-ray can induce higher crystallinity in the polypropylene at low irradiation dose.

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19

Fujimatsu, Hitoshi, and Shigetaka Kuroiwa. "Adhesion of molded polypropylene using polypropylene gels." Journal of Colloid and Interface Science 123, no. 1 (1988): 309–11. http://dx.doi.org/10.1016/0021-9797(88)90250-0.

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20

Nam, Byung-Kook, O. Ok Park, and Sung-Chul Kim. "Properties of isotactic polypropylene/atactic polypropylene blends." Macromolecular Research 23, no. 9 (2015): 809–13. http://dx.doi.org/10.1007/s13233-015-3106-1.

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21

Guan, Yong, Shuzhong Wang, Anna Zheng, and Huining Xiao. "Crystallization behaviors of polypropylene and functional polypropylene." Journal of Applied Polymer Science 88, no. 4 (2003): 872–77. http://dx.doi.org/10.1002/app.11668.

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22

Petková, Mária, Anna Ujhelyiová, Jozef Ryba, Marcela Hricová, and Vladimír Kovár. "Sorption Capabilities of Polypropylene/Modified Polypropylene Fibers." Fibers 11, no. 12 (2023): 102. http://dx.doi.org/10.3390/fib11120102.

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The aim of this paper is to present the influence of the modification of polypropylene (PP) fibers on the sorption capabilities of the fibers. The physical modification of the PP fibers was made with inorganic nanoadditives in the mass, with a view to improving the properties of silicate composites used in the construction industry. The compositions of the modified PP fibers using two different nanoadditives were based on previous work, as well as the work presented in this paper. The prepared modified PP fibers were compared with pure PP fibers, and their mechanical and thermomechanical prope

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23

Seyam, Ahmed Maher, Samir Shihada, and Rita Nemes. "Effects of polypropylene fibers on ultra high performance concrete at elevated temperature." Concrete Structures 21 (2020): 11–16. http://dx.doi.org/10.32970/cs.2020.1.2.

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This paper presents an experimental study to evaluate the influence of polypropylene on fire resistance of ultra-high performance concrete (UHPC). Concrete mixtures are prepared by using different percentages of polypropylene fibres 0%, 0.75% and 1.5%, by volume. Samples are heated to 250 or 500 °C, for exposures 2.5 or 5 hours, and tested after cooling for compressive strength and flexural tensile strength. The research includes the use of mineral admixture of a recognized, polypropylene fibre, quartz sand, superplasticizers and without using any type of aggregates other than the quartz sand.

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24

Nasution, Arlan B., Alfian Hamsi, Mahadi, Andianto Pintoro, and Achmad Husein Siregar. "STUDI PENGARUH CAMPURAN 4 %, 4,5 %, DAN 5 % POLYPROPYLENE PADA ASPAL PENETRASI 60/70 TERHADAP KEKUATAN TEKAN (COMPRESSIVE STRENGHT) DAN UJI PENYERAPAN AIR." DINAMIS 5, no. 4 (2017): 9. http://dx.doi.org/10.32734/dinamis.v5i4.7077.

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Polypropylene digunakan sebagai bahan campuran aspal dalam penelitian ini karena polypropylene mempunyai titik leleh yang cukup tinggi (160 – 166 C), Polypropylene mempunyai ketahanan terhadap bahan kimia (chemical resistance) yang tinggi, polypropylene mempunyai kekuatan benturan (impact strength) yang tinggi dan ketahanan yang tinggi terhadap pelarut organik. Tujuan penelitian ini adalah untuk memperoleh dan menganalisis kekuatan tekan dan uji penyerapan air pada aspal modifikasi dengan pencampuran 4%, 4,5% dan 5% polypropylene. Hasilnya, diperoleh kekuatan tekan briket untuk aspal murni ada

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25

Dikobe, DG, and AS Luyt. "Investigation of the morphology and properties of the polypropylene/low-density polyethylene/wood powder and the maleic anhydride grafted polypropylene/low-density polyethylene/wood powder polymer blend composites." Journal of Composite Materials 51, no. 14 (2016): 2045–59. http://dx.doi.org/10.1177/0021998316668399.

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The properties of polypropylene/low-density polyethylene and maleic anhydride grafted polypropylene/low-density polyethylene blends, and their wood powder composites are compared in this study. The blends contained equal amounts of polymers, and the wood powder was added into the blends to form polypropylene/low-density polyethylene/wood powder and maleic anhydride grafted polypropylene/low-density polyethylene/wood powder ternary systems. The Fourier-transform infrared analysis of the blends and composites did not provide any evidence of significant interactions between the different componen

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26

Zenzingerová, Soňa, Jana Navratilova, Lenka Gajzlerová, et al. "Polypropylene blends: Impact of long chain-branched polypropylene on crystallization of linear polypropylene." Express Polymer Letters 18, no. 9 (2024): 921–30. http://dx.doi.org/10.3144/expresspolymlett.2024.69.

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27

Ouyang, Dong, Lin Jie Kong, Hao Fu, Liu Li Lu, Long Liao, and Chen Wu Huang. "Experimental Investigations on Mechanical Properties and Fire Resistance of Steel-Polypropylene Hybrid Fiber Reinforced Concrete." Advanced Materials Research 772 (September 2013): 182–87. http://dx.doi.org/10.4028/www.scientific.net/amr.772.182.

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This paper investigates the mechanical properties and the fire resistance of steel-polypropylene hybrid fiber-reinforced concrete. The type of the polypropylene fibers are polypropylene monofilament fiber, polypropylene fibrillated fiber, and macro polypropylene fiber, and the type of the steel fibers is hooked steel fiber. The experimental results show that the compressive strength, splitting tensile strength and flexural properties of steel-macro polypropylene hybrid fiber reinforced concrete are better than any others. And the fire resistance of steel-monofilament polypropylene hybrid fiber

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28

Wang, Ya Zhen, Shou Cheng Xue, Tian Yu Lan, and Yan Ling Zhang. "Study on Weathering Quality of PP/PP-g-AN Blend." Applied Mechanics and Materials 151 (January 2012): 209–12. http://dx.doi.org/10.4028/www.scientific.net/amm.151.209.

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Acrylonitrile grafted polypropylene for grafting modification of polypropylene. Different mass polypropylene-g-acrylonitrile (PP-g-AN) was blended with polypropylene. The aging behavior pattern of PP/PP-g-AN was studied on the condition high temperature and illumination. Mechanical properties of different blend ratios were systemic studied on different accelerated weathering process. The results indicated that acrylonitrile grafted polypropylene effective improved weathering resistant of polypropylene.

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29

Xuan, Wei Hong, Yan Wang, and Yu Zhi Chen. "Microcosmic Analysis on Bonding Performance of Polypropylene Fiber Concrete." Advanced Materials Research 168-170 (December 2010): 2150–53. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.2150.

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In the process of pull out testing polypropylene fiber, the performance of bonding of tested and untested objects has been microscopically analyzed; both the interface of polypropylene fiber-cement-based material, the hole morphology of cement-based material after the polypropylene fiber being pulled out by force and the condition after the polypropylene fiber being pulled out of concrete-based material are observed. Attachment phase analyses of the surface of the polypropylene fiber and cement-based transverse cracks after the polypropylene fiber being pulled out have both confirmed the fact

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30

Kasprzak, Adam. "Triaxiality and Plastic-Strain-Dependent Proposed PEAK Parameter for Predicting Crack Formation in Polypropylene Polymer Reservoir Subjected to Pressure Load." Polymers 16, no. 15 (2024): 2128. http://dx.doi.org/10.3390/polym16152128.

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This article raises the topic of the critical examination of polypropylene, a key polymeric material, and its extensive application within the automotive industry, particularly focusing on the manufacturing of brake fluid reservoirs. This study aims to enhance the understanding of polypropylene’s behavior under mechanical stresses through a series of laboratory destruction tests and numerical simulations, emphasizing the finite element method (FEM). A novel aspect of this research is the introduction of the PEAK parameter, a groundbreaking approach designed to assess the material’s resilience

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31

Al Faritzie, Hariman, Indra Syahrul Fuad, and Imam Akbar. "Pengaruh Penambahan Serat Polypropylene Serta Super Plasticizer Terhadap Kuat Tekan Dan Tarik Belah Beton." Jurnal Deformasi 8, no. 1 (2023): 38–44. http://dx.doi.org/10.31851/deformasi.v8i1.11576.

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Beton merupakan material yang paling banyak digunakan dalam bangunan konstruksi. Beton adalah campuran semen, agregat halus, agregat kasar, dan air, serta dapat ditambah bahan tambah lain dengan perbandingan tertentu. Penelitian ini menggunakan bahan dengan potongan serat polypropylene serta super plasticizer sebagai bahan tambah campuran beton terhadap kuat tekan dan tarik belah beton. Benda uji berupa silinder dengan variasi normal dan serat polypropylene 0,25%, 0,50%, 0,75% serta super plasticizer 1%, 2%, 3% dengan umur perawatan 7, 14, 21, 28 hari. Hasil penelitian pada variasi campuran se

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32

Shao, Dongfeng, Hongwei Zhang, Lizhen Tao, Kan Cao, and Qufu Wei. "A Facile Approach for Preparing Ag Functionalized Nonwoven Polypropylene Membrane to Improve Its Electrical Conductivity and Electromagnetic Shielding Performance." Materials 12, no. 2 (2019): 296. http://dx.doi.org/10.3390/ma12020296.

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The commonly used preparation methods of polypropylene functionalization require special equipment to be put into use or take a long time, which limits its application. Therefore, a simple and economical method for preparing silver functionalized nonwoven polypropylene membrane was studied herein. Triethanolamine was first coated on the surface of the polypropylene, and then Ag was deposited on the surface of polypropylene using a continuous reduction reaction of triethanolamine and silver ions. Surface morphology, crystal structure, and surface chemistry during the preparation of Ag functiona

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33

Jar, Naw, Fengtao Chen, and Jin-Yong Dong. "Synthesis of Star Isotactic Polypropylene via Styryldichlorosilane/Hydrogen Consecutive Chain Transfer Reaction." Catalysts 15, no. 4 (2025): 331. https://doi.org/10.3390/catal15040331.

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This paper elucidates the consecutive chain transfer reaction, initially to (p-vinylphenyl) methyl dichlorosilane (or (p-vinylbenzyl) methyl dichlorosilane), followed by hydrogen, during metallocene-catalyzed propylene polymerization by an isospecific metallocene catalyst (i.e., rac-dimethylsilylbis(2-methyl-4-phenylindenyl)zirconium dichloride, I)/ activated with methylaluminoxane (MAO), rendering a catalytic access styryldichlorosilane capped isotactic polypropylenes (iPP). The PP molecular weight is inversely related to the molar ratio of [(p-vinylphenyl) methyl dichlorosilane]/[propylene]

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34

Kasmuri, Norhafezah, Nurul Farhanah Ahmad Fauzi, Satoto Endar Nayono, Mohd Fuad Miskon, and Helmy Salim. "Enhancement of Water Quality Parameters with Microplastics via Electrocoagulation." Malaysian Journal on Composites Science and Manufacturing 16, no. 1 (2025): 167–83. https://doi.org/10.37934/mjcsm.16.1.167183.

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Microplastics are classified into two groups: any plastic pieces or particles already 5.0 mm in size or smaller. Primary microplastics include clothing microfibers, microbeads, and plastic pellets (nurdles), and the other is secondary microplastics, which form when bigger plastic materials degrade (break down) in the environment due to natural weathering processes. Secondary microplastics originated from drinking bottles, fishing nets, plastic bags, microwave containers, tea bags, and tyres. Both varieties persist at high environmental levels, particularly in aquatic and marine habitats. A wat

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35

IGARASHI, AKIRA, and WATARU KINOUCHI. "Polypropylene Fiber." FIBER 66, no. 6 (2010): P.196—P.198. http://dx.doi.org/10.2115/fiber.66.p_196.

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36

BAUM, RUDY. "ELASTOMERIC POLYPROPYLENE." Chemical & Engineering News 73, no. 3 (1995): 6–7. http://dx.doi.org/10.1021/cen-v073n003.p006.

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37

Borsig, E. "POLYPROPYLENE DERIVATIVES." Journal of Macromolecular Science, Part A 36, no. 11 (1999): 1699–715. http://dx.doi.org/10.1081/ma-100101621.

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38

Elias, Hans-G., Toshio Ogawa, and Young-Ha Kim. "Syndiotactic polypropylene." Journal of Polymer Science: Polymer Symposia 72, no. 1 (2007): 79. http://dx.doi.org/10.1002/polc.5070720114.

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39

Landoll, L. M., and D. S. Breslow. "Polypropylene ionomers." Journal of Polymer Science Part A: Polymer Chemistry 27, no. 7 (1989): 2189–201. http://dx.doi.org/10.1002/pola.1989.080270705.

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40

Antinucci, Giuseppe, Roberta Cipullo, and Vincenzo Busico. "Imagine polypropylene." Nature Catalysis 6, no. 6 (2023): 456–57. http://dx.doi.org/10.1038/s41929-023-00975-8.

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41

Visscher, E. J., and R. C. Willemse. "Interfacial tension of polypropylene/polystyrene: Degradation of polypropylene." Polymer Engineering & Science 39, no. 7 (1999): 1251–56. http://dx.doi.org/10.1002/pen.11512.

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42

Canevarolo, S., and F. De Candia. "Stereoblock polypropylene/isotactic polypropylene blends. I. Phase organization." Journal of Applied Polymer Science 54, no. 13 (1994): 2013–21. http://dx.doi.org/10.1002/app.1994.070541303.

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43

Canevarolo, S. V., F. De Candia, and R. Russo. "Stereoblock polypropylene/isotactic polypropylene blends. II. Mechanical behavior." Journal of Applied Polymer Science 55, no. 3 (1995): 387–92. http://dx.doi.org/10.1002/app.1995.070550302.

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44

Kmetty, Ákos, Tamás Bárány, and József Karger-Kocsis. "Injection moulded all-polypropylene composites composed of polypropylene fibre and polypropylene based thermoplastic elastomer." Composites Science and Technology 73 (November 2012): 72–80. http://dx.doi.org/10.1016/j.compscitech.2012.09.017.

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45

Özen, İlhan, Gamze Okyay, Süleyman Şimşek, and Deniz Duran. "Oil absorbency of diatomite-embedded polypropylene meltblown composite structures." Journal of Industrial Textiles 46, no. 7 (2016): 1552–78. http://dx.doi.org/10.1177/1528083715627163.

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In this study, optimized conditions were established for diatomite grinding, which is a natural inorganic mineral with inherently high oil absorption capacity. Diatomite surface was modified with a fluorocarbon chemical and stearic acid via facile methods for enhancing compatibility between polypropylene and diatomite. Polypropylene/diatomite composites were generated in a twin screw extruder with/without using compatibilizer, and nonwoven structures were produced via meltblown technique. Pore size and void content analyses showed that addition of diatomite led to thicker fibers (1–17 µm (the

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46

Chervakov, D. O., O. S. Sverdlikovska, and O. V. Chervakov. "Development of thermoplastic composite materials based on modified polypropylene." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 3 (May 2021): 145–49. http://dx.doi.org/10.32434/0321-4095-2021-136-3-145-149.

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To improve the physical-mechanical and thermophysical properties of polypropylene-based thermoplastic composite materials, we performed modification of a polymer matrix by reactive extrusion of polypropylene in the presence of benzoyl peroxide and polysiloxane polyols. Modified polypropylene was compounded with basalt, carbon, and para-aramide reinforcing fillers in a screw-disc extruder. It was established that the reinforcement of modified polypropylene by basalt fibers ensured a 110% increase in tensile strength. The reinforcement of modified polypropylene by carbon fibers allowed fabricati

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Ouchi, Tetsu, Misuzu Yamazaki, Tomoki Maeda, and Atsushi Hotta. "Mechanical Property of Polypropylene Gels Associated with That of Molten Polypropylenes." Gels 7, no. 3 (2021): 99. http://dx.doi.org/10.3390/gels7030099.

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This study aims to understand the fundamental mechanical relationship between polypropylene (PP)-gels and solid PPs without solvent through mechanical and thermal analyses, by which the mechanical similarities between molten PPs and PP gels were found, leading to the reliable estimate of the mechanical properties of semi-crystalline gels. The gelation of syndiotactic and isotactic polypropylenes (sPP and iPP) was found when PPs were dissolved in 1,2,3,4-tetrahydronaphthalene (tetralin). Interestingly, it was found that the storage modulus of sPP-gel became higher than that of iPP-gel at low PP

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48

Demori, Renan, Eveline Bischoff, Ana P. de Azeredo, Susana A. Liberman, Joao Maia, and Raquel S. Mauler. "Morphological, thermo-mechanical, and thermal conductivity properties of halloysite nanotube-filled polypropylene nanocomposite foam." Journal of Cellular Plastics 54, no. 2 (2016): 217–33. http://dx.doi.org/10.1177/0021955x16681449.

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Studies about polypropylene nanocomposite foams are receiving attention because nanoparticles can change physical and mechanical properties, as well as improve foaming behavior in terms of homogeneous cell structure, cell density, and void fraction. In this research, the foaming behavior of polypropylene, polypropylene/long-chain branched polypropylene (LCBPP) 100/20 blend, and polypropylene/LCBPP/halloysite nanocomposites with 0.5 and 3 parts per hundred of resin (phr) is studied. The LCBPP was used to improve the rheological properties of polypropylene/LCBPP blend, namely the degree of strai

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49

Nakada, Masayuki, Yasushi Miyano, Yoko Morisawa, Takeharu Isaki, Taiki Hirano, and Kiyoshi Uzawa. "Statistical life prediction of unidirectional carbon fiber/polypropylene tape under creep tension load." Journal of Reinforced Plastics and Composites 39, no. 7-8 (2020): 278–84. http://dx.doi.org/10.1177/0731684419900319.

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Recently, a carbon fiber/polypropylene unidirectional sheet has been developed by Mitsui Chemicals, Inc. from a new polyolefin-based sizing agent for carbon fiber. Its effective polypropylene modification brings good compatibility with polypropylene to improve the fiber matrix adhesion. This study examines the prediction of the statistical lifetime of this developed carbon fiber/polypropylene unidirectional sheet under creep tension loading. First, a tensile test method for static and creep strengths at elevated temperatures was developed for carbon fiber/polypropylene unidirectional tape cut

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Naushad, Md, Sanjay K. Nayak, Smita Mohanty, and Bishnu P. Panda. "Mechanical and damage tolerance behavior of short sisal fiber reinforced recycled polypropylene biocomposites." Journal of Composite Materials 51, no. 8 (2016): 1087–97. http://dx.doi.org/10.1177/0021998316658945.

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Sisal fiber (SF) reinforced recycled polypropylene biocomposites were prepared by melt blending technique. Biocomposites prepared with the incorporation of 40 wt% untreated sisal fiber loading showed a marginal improvement in mechanical properties as compared with matrix recycled polypropylene. SF surface was mercerized and maleic anhydride grafted polypropylene was used as a coupling agent for better fiber matrix interfacial bonding. Mercerized sisal fiber reinforced biocomposites prepared with compatibilizer (maleic anhydride grafted polypropylene) shows significant improvement in tensile an

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